Trocar



Feb. 16 1926.

J. a. DAIREAUX TROCAR Filed Jun 18, 1924 A THOR/ 576 Falented Feb.16,1925.

:j UNITED STAT JORGE ease IDAIBEAUX', or BUENOS Aims, A GENTINA.

' anocnn.

' Application filed a'une 18, 1924; Seria1 "No L'72t)',803i

To all whom it'mey concern;-

I Be it known that I, JoReE GAso DAIREAUX,

a citizen of the Republic of Argentina, re siding at Maipu 671, BuenosAire'afArgentina, have invented a new and useful Trocar, of which thefollowing is a specification.

This invention is for a new veterinary apparatus for the exclusivepurpose of operatapparatus, known astrocars,

ing on food bound animals. As is well known, except n i'ery rare cases,bound animals almost invariably die if intervention be not taken withoutdelay and an opening made in the stomach allowing of the escape of thegases and matter which produce ;the swelling, the characteristicsymptoms of this illness. .At present tins operation is effected bymeans ofspecial or simply by means of knives. V g

Although the above means may result in saving the animals, they 'bothotter serious deficiencies.

apparatus in case several 'animalsare efi'ected at the same time, asthe'tube has, to be loft in the wound. Again," when the tube has beeninserted it isv very prone to become blocked by the matter drawn 011',and this means that the operator has to"maintain a constant watch inorder to clear the tube each time it gets stopped up. otherwise theapparatus would be ineffective. The skin contracts as the swelling geesdown,

V and the tube remains tightly gripped, thus Operations practised withknives cause, of necesslty, large wounds, since the-tenslon of the skintends to close 'up' the wound.

Iherefore, as is easily understoocLit takesa I long time to. heal,leaving the animal in a weak state and exposed to risk of infections."

ing a kind of hinged flap, which later isusedas a covering to aid theclosing-of the wound after the swelling has subsided. Obviously when theincision is iirst made .tllB tension of the swelled body draws theincision open and holds it open. and this continues until the swellingsubsides. With tins instrument a large number oi animals As regards thefirst,it is necessary to keep on hand a number of these giving rise totears 1n the -wound, which makes it difiicult to healwhen the" tube iswithdrawn.

can be'operated on very rapidly, without need for accessory parts,andthe punctures practised do not get blocked up. nor do they requireany attention whatsoever during the evacuation the wound healing veryrapidly as soon as this ceases and allows the contraction of the skin.

For the betterunderst'anding of scription the following detaileddrawings are attached Figure 1, showing in perspective an instrument formaking punctures in foodhound animals. 7 v Figure 2, showing same inplan view.

Figure 3, showing the form of the incision in the skin. I

In these figures the part numbered 1, is

- the cutting part of the instrument, which is Iormed of a, steel tubethat'may be opened 7 this de along its length or not, and the end ofthis is cut off obliquely, the edge of this oblique out being sharpenedall round,the section thus being as shown'in Fig. 2,: 1t may be made inthe form of a complete circle, pro vided that the sector below 1 isleft'unsharpcncd, or that it has aprojection to prevent 7 that portionfrom cutting and also to act as a stop,

thus avoiding a deeper penetration than necessary. In thiswaythe'apparatus, independent of a handle, may be formed of a simpletubecut off in theYm-anner described. g 7

The drawmg only shows one of many ways in which the cutting instrumentcan be mounted.

In the present case the stop is i'ormed'by the end washer, numbered 2,which is fixed Y 011 the handle, numbered 3, holding the cutting part. 5g As is shown in Figure 3 the incision made by the instrument isasemi-circular one.' Due to this special form" of incision the part Adoes not oppose any resistance to the internal pressure and allows thefree escape of the gases and matter; When] the skin Lonlracts, theperforation shrinks and the centre part of thesemi-circle closes it up,thus aiding in a speedy healing. [The character of this invention andthe way in which it is put into practice having thus beendescribed andspecified, I claim as being my exclusive invention and property: c j Aninstrument for making punctures in bound animals, comprising a handlero- Ill) ing a Hat face at right angles to the 1ongi edges extendingthroughout their length, Ludinal axis of the handle, and a cuttingwhereby the flat face of the enlargement 0t 10 blade secured theretoprojecting centrally the handle forms a stop to limitche punclroni theface of the enlargement and in ture and provision is made for making aline With the handle, said blade being curved incision Which is greaterthan a semicurved transversely and having its edges circle andfacilitates closing of the Wound. gradually inclined to form a pointedend,'

said edges being sharpened t0 fOI'EI-l cutting v JORGE GASC DAIREAUX.

